I have a 1995 mercury cougar and ijust replaced the heater core(big job) had to remove whole dash. Now the ac works, but i cannot switch from air to heat, or change from defrosters to vent/floor ext... i think it might be the blend door or vent actuator. But i cant find any answers online. Pls help

Removing the Old Core

• Disconnect the Mercury Cougar's negative battery cable. Remove the center console from the interior. Disarm the car's air bag system and remove the bag's diagnostic monitor and bracket.
  

• Take the heater outlet floor duct out of the car. Remove the screw holding the air transfer duct and push it into the outlet duct. Unscrew the screws retaining the outlet duct to the heater core cover and release the retaining tabs on each side to remove the duct.
  

• Raise and support the Mercury Cougar, using multiple jackstands. Drain the engine coolant by removing the drain plug on the bottom of the radiator. Replace the drain plug after all the liquid flows into a clean container and disconnect the heater hoses from the core
  

• Withdraw the black vacuum supply hose from the vacuum source (you can now lower the vehicle). Disconnect the same hose from the air conditioner's vacuum reservoir tank.
  

• Detach the heater core cover that holds the core by releasing the retaining tabs and removing the clips. Remove the dash panel seal, vacuum hose and heater core bracket from the cover.
  

• Remove the heater core from the cover and the case seal from the core
  

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A/C & Heater Controls for Mercury ' eBay

Instructions

1. • 1Remove the dashboard. The heater core in S10s is behind the main dashboard, and it must be removed to access the core. The front dash panel can be removed by unbolting several screws at the bottom of the panel, then pulling the panel away from the dash. Once this front panel is off, the primary dash can be unbolted from the firewall with four large bolts below the windshield. Several accessories may need to be taken out to unbolt the dash from the firewall, such as the radio or 4WD switches.
   • 2 Drain the coolant from the core. There is a drain plug at the bottom right of the primary radiator that will empty the coolant system when unscrewed. Some residual coolant might remain in the core, but it will come out when the core is taken out
     
   • 3 Uncouple the core from the coolant lines. These hoses are directly behind the oil filler tube and will come loose when squeezed with pliers. They are of different sizes, and it won't be necessary to mark them for later re-attachment.
     
   • 4 Unbolt the core from its mounts behind the removed dash panel. Several bolts might be difficult to reach, but once free from the mounts, the core assembly slides up and out toward the interior of the truck. Lay a towel down when removing the core, as come coolant might splash out.
     
   • 5 Insert the new heater core and bolt it into the mounts. The openings will fit into the holes provided in the firewall.
     
   • 6 Reconnect the heater core hoses, and re-attach the dashboard and front panel.
     
   • 7 Fill the coolant system with a 50/50 mix of antifreeze and water. Tighten the drain plug on the radiator, then fill it. Crank the truck up with the heater system on its maximum setting and continue to pour coolant into the radiator until it will not take in any more.
     

Read more : http://www.ehow.com/how_5201441_change-heater-core-chevrolet-s10.html

remove your whole dash its a big job

1996 mercury cougar heater core replacement
we just bought a car with the same problem

http://members.tccoa.com/timb/Heatercore.htm

we did not have the bolt above the gas pedal
"1 on the tunnel above the gas pedal"

Yes you will need to remove the steering column and the dash, also center console if equiped, empty freon from the ac system, this is done to be able to remove the box with core.

THAT IS A BIG JOB MY FRIEND YOU HAVE TO TAKE THE WHOLE DASHBOARD OUT TO GET TO THE CORE I OWN A 95 T BIRD AND SAME PROBLEM COSTS ABOUT 5 TO 6 HUNDRED AT THE RAD SHOP GOOD LUCK

if the engine cooling system was not filled and air bleed out the system may have an air pocket and this keeps the gauge from reading correctly.

they radiator flush has created a blockage in the heater core that creates the heat. you dont want to replace this part because it can get $$$$. i would take it back to the shop and have them try the service again( at no charge) to see if it can remove the block

how about some more info man. do you mean the heater fan is not blowing air? if that is the case it is easy to fix. most cases it is a fan motor or a blower motor resistor. if you are getting air flow but you can't switch it from hot to cold. it could be a blend door. that is a relativly large job. the dash would have to come out. do the coolant lines to the heater core both get hot? if not the core could be pluged. does your a/c even kick in or work. you could have many problems causing this.